Ubuntu first five commands (beginner's tutorial)

0. sudo su 01:55
1. cd (change directory) 02:58
2. ls (list files) 04:05
* pwd 05:30
3. mkdir (make directory) 07:30
4. rmdir (remove directory) 09:25
5. rm -r (remove recursive) 11:55

It was 5 first and basic commands, and in the next tutorial i will show next 5 commands: